Answered: a) A machine is set to produce disc…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

a) A machine is set to produce disc plates with a mean diameter of 14 mm. A sample of 8 discs
gave a mean diameter, ?̅ = 14.9 mm and a standard deviation, s = 1.33 mm. A test was
carried out at the 5% level of significance to determine whether the machine is in good
working order. Assume that the diameter of the disc follows a normal distribution.

ii. State, with reasons, whether a t-test or a z-test will be appropriate.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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